The granularity of things whose nature is described as they are considered by some agent. This should be done by adding a triadic predicate which relates an agent, an entity, and a reason (eg reason(a,e,r)). For example, the predicate 'spherical(x)' can be true of any physical object at the '_intentional' granularity only because an agent wants to consider it so for some reason, for example approximating a sphere-like for computing an orbit, a speed, etc.